comp.lang.python Google Group

Python and webcam capture delay?

nom...@thank.you (jack catcher (nick)) — Sun, 07 July 2009 15:26:21 UT

Hi,
I'm thinking of using Python for capturing and showing live webcam
stream simultaneously between two computers via local area network.
Operating system is Windows. I'm going to begin with VideoCapture
extension, no ideas about other implementation yet. Do you have any
suggestions on how short delay I should hope to achieve in showing the

Re: Code that ought to run fast, but can't due to Python limitations.

a...@pythoncraft.com (Aahz) — Sun, 07 July 2009 15:08:23 UT

In article <mailman.2639.1246802753.8015. python-l...@python.org>,
Calls to iterators created by generators are indeed faster than an
ordinary Python call, because the stack frame is already mostly set up.

Re: Problems with using queue in Tkinter application

asm...@gmail.com (Icarus) — Sun, 07 July 2009 14:56:26 UT

You had it Peter. I tried the "import pydoc pydoc.gui()" in the bug
report you referenced and the same thing described there occurred.
After recompiling tcl/tk with --threads-enabled and replacing the
slackware default packages with those everything is working as I
expected. Thanks for the help.

Re: How Python Implements "long integer"?

tn.pa...@gmail.com (Pablo Torres N.) — Sun, 07 July 2009 14:30:47 UT

I think he means the entry point, problem is that libraries have many.

Re: Code that ought to run fast, but can't due to Python limitations.

l.mastrodomen...@gmail.com (Lino Mastrodomenico) — Sun, 07 July 2009 14:25:31 UT

2009/7/5 Hendrik van Rooyen <m...@microcorp.co.za>:
A simple solution may be to read the whole input HTML file in a
string. This potentially requires lots of memory but I suspect that
the use case by far most common for this parser is to build a DOM (or
DOM-like) tree of the whole document. This tree usually requires much

Re: How Python Implements "long integer"?

pm567...@gmail.com (Pedram) — Sun, 07 July 2009 14:15:11 UT

Yes, I'm trying :)
Oh, I didn't see long_as_number before. I'm reading it. That was very
helpful, thanks.
Thank you a million.
I will write your name in my "Specially thanks to" section of my
article (In font size 72) ;)
Pedram

Re: Code that ought to run fast, but can't due to Python limitations.

m...@microcorp.co.za (Hendrik van Rooyen) — Sun, 07 July 2009 14:03:05 UT

I agree about the ord(c). However, avoiding the function call
is, I think, right now, in the realms of wishful thinking.
I cannot see how you could avoid a python function call - even if he
bites the bullet and implements my laborious scheme, he would still
have to fetch the next character to test against, inside the current state.

Re: Code that ought to run fast, but can't due to Python limitations.

m...@microcorp.co.za (Hendrik van Rooyen) — Sun, 07 July 2009 13:45:45 UT

I am well aware that John is not a newbie.
He was complaining about Python's lack of a case statement
in the context of a state machine.
The point I was trying to make is that, if any state machine
is examined, then, if you examine any one state, the reasons
for leaving it ("state transitions") is always a subset of the

Re: question of style

(Paul Rubin) — Sun, 07 July 2009 13:12:25 UT

re is a common source of this type of bug but there are others.
4. Have re.search return a bool and possible matchobject separately:
put_match_here = []
if re.search(pat, s, target=put_match_here):
do_something_with(put_match_he re[0])
or alternatively (cleaner), have a new type of object which supports

Re: How Python Implements "long integer"?

dicki...@gmail.com (Mark Dickinson) — Sun, 07 July 2009 13:04:11 UT

That's shocking. Everyone should be English. :-)
I'd pick one operation (e.g., addition), and trace through the
relevant functions in longobject.c. Look at the long_as_number
table to see where to get started.
In the case of addition, that table shows that the nb_add slot is
given by long_add. long_add does any necessary type conversions

ANN: A new version of the Python module which wraps GnuPG has been released.

vinay_sa...@yahoo.co.uk (Vinay Sajip) — Sat, 07 July 2009 15:12:36 UT

A new version of the Python module which wraps GnuPG has been
released.
What Does It Do?
================
The gnupg module allows Python programs to make use of the
functionality provided by the Gnu Privacy Guard (abbreviated GPG or
GnuPG). Using this module, Python programs can encrypt and decrypt
data, digitally sign documents and verify digital signatures, manage

Re: PSP Caching

mjohn...@cfi.co.ug (Johnson Mpeirwe) — Sun, 07 July 2009 12:27:12 UT

Thanks Simon,
I got around this behavior by adding "MaxRequestsPerChild 1" (default value
of this is 0) to my httpd.conf to limit the number of requests a child server
process will handle before it dies but I think it is important to keep it 0 in
production environment.
Regards,
Johnson

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Re: Is code duplication allowed in this instance?

drobi...@gmail.com (David Robinow) — Sun, 07 July 2009 12:21:33 UT

On Sun, Jul 5, 2009 at 5:54 AM, Lawrence
Heavens, no. He's too valuable as a managee.

Re: How Python Implements "long integer"?

pm567...@gmail.com (Pedram) — Sun, 07 July 2009 12:09:49 UT

Thanks for reply,
Sorry I can't explain too clear! I'm not English ;)
But I want to understand the implementation of long int object in
Python. How Python allocates memory and how it implements operations
for this object?
Although, I'm reading the source code (longobject.c and as you said,
longintrepr.h and longobject.h) but if you can help me, I really